A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Stay cables are some of the most critical structural components of a bridge. However, stay cables readily suffer from fatigue damage, corrosion damage and their coupled effects. Thus, health monitoring of stay cables is important for ensuring the integrity and safety of a bridge. Glass Fibre Reinforced Polymer Optical Fibre Bragg Grating (GFRP-OFBG) cable, a kind of fibre Bragg grating optical sensing technology-based smart stay cables, is proposed in this study. The fabrication procedure of the smart stay cable was developed and the self-sensing property of the smart stay cable was calibrated. The smart stay cable was fabricated as a common cable and no special process was needed. The smart stay cable has good self-sensing properties and discrepancies between measurement and theoretical values are very small. The application of the smart stay cables on the Tianjin Yonghe Bridge was demonstrated and the vehicle live load effects smart stay cables were evaluated based on field monitoring data. Furthermore, the probability distribution and extreme value distribution of live load effects of the stay cables were established. Finally, the fatigue load effects of smart cables and fatigue accumulative damage of the smart stay cables was evaluated based on field monitoring data. The I measurements indicate that the stress range of shorter cables was larger than that of longer cables suffering from the same traffic loads. Therefore, the shorter cables are more sensitive to fatigue damage. Based on the time-history of stress, the fatigue accumulative damage evolution of stay cable can be obtained.
Stay cables are some of the most critical structural components of a bridge. However, stay cables readily suffer from fatigue damage, corrosion damage and their coupled effects. Thus, health monitoring of stay cables is important for ensuring the integrity and safety of a bridge. Glass Fibre Reinforced Polymer Optical Fibre Bragg Grating (GFRP-OFBG) cable, a kind of fibre Bragg grating optical sensing technology-based smart stay cables, is proposed in this study. The fabrication procedure of the smart stay cable was developed and the self-sensing property of the smart stay cable was calibrated. The smart stay cable was fabricated as a common cable and no special process was needed. The smart stay cable has good self-sensing properties and discrepancies between measurement and theoretical values are very small. The application of the smart stay cables on the Tianjin Yonghe Bridge was demonstrated and the vehicle live load effects smart stay cables were evaluated based on field monitoring data. Furthermore, the probability distribution and extreme value distribution of live load effects of the stay cables were established. Finally, the fatigue load effects of smart cables and fatigue accumulative damage of the smart stay cables was evaluated based on field monitoring data. The I measurements indicate that the stress range of shorter cables was larger than that of longer cables suffering from the same traffic loads. Therefore, the shorter cables are more sensitive to fatigue damage. Based on the time-history of stress, the fatigue accumulative damage evolution of stay cable can be obtained.
Cable live load effects-based smart stay cables
2009
8 Seiten, 9 Bilder, 7 Quellen
Conference paper
English
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